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1546. By He Zhe <email address hidden> on 2021-04-19

lttng-probes: Warn of event's and provider's name for mismatch

We have experience serveral cases of such mismatches. To make it easier to
debug, let's warn users of the event's and the provide's name.

Signed-off-by: He Zhe <email address hidden>
Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I455bf92f9f735f890753c9103d22986e56e02e5d

1545. By He Zhe <email address hidden> on 2021-04-19

fix: mm, tracing: kfree event name mismatching with provider kmem (v5.12)

a8bc8ae5c932 ("fix: mm, tracing: record slab name for kmem_cache_free() (v5.12)")
introduces the following call trace for kfree. This is caused by mismatch
between kfree event and its provider kmem.

This patch maps kfree to kmem_kfree.

WARNING: CPU: 2 PID: 42294 at src/lttng-probes.c:81 fixup_lazy_probes+0xb0/0x1b0 [lttng_tracer]
CPU: 2 PID: 42294 Comm: modprobe Tainted: G O 5.12.0-rc6-yoctodev-standard #1
Hardware name: Intel Corporation JACOBSVILLE/JACOBSVILLE, BIOS JBVLCRB2.86B.0014.P20.2004020248 04/02/2020
RIP: 0010:fixup_lazy_probes+0xb0/0x1b0 [lttng_tracer]
Code: 75 28 83 c3 01 3b 5d c4 74 22 48 8b 4d d0 48 63
      c3 4c 89 e2 4c 89 f6 48 8b 04 c1 4c 8b 38 4c 89
      ff e8 64 9f 4b de 85 c0 74 c3 <0f> 0b 48 8b 05 bf
      f2 1e 00 48 8d 50 e8 48 3d f0 a0 98 c0 75 18 eb
RSP: 0018:ffffb976807bfbe0 EFLAGS: 00010286
RAX: 00000000ffffffff RBX: 0000000000000004 RCX: 0000000000000004
RDX: 0000000000000066 RSI: ffffffffc03c10a7 RDI: ffffffffc03c11a1
RBP: ffffb976807bfc28 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000004
R13: ffffffffc03c2000 R14: ffffffffc03c10a7 R15: ffffffffc03c11a1
FS: 00007f0ef9533740(0000) GS:ffffa100faa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561e8f0aa000 CR3: 000000015b318000 CR4: 0000000000350ee0
Call Trace:
 lttng_probe_register+0x38/0xe0 [lttng_tracer]
 ? __event_probe__module_load+0x520/0x520 [lttng_probe_module]
 __lttng_events_init__module+0x15/0x20 [lttng_probe_module]
 do_one_initcall+0x68/0x310
 ? kmem_cache_alloc_trace+0x2ad/0x4c0
 ? do_init_module+0x28/0x280
 do_init_module+0x62/0x280
 load_module+0x26e4/0x2920
 ? kernel_read_file+0x22e/0x290
 __do_sys_finit_module+0xb1/0xf0
 __x64_sys_finit_module+0x1a/0x20
 do_syscall_64+0x38/0x50
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Signed-off-by: He Zhe <email address hidden>
Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I00e8ee2b8c35f6f8602c88295f5113fbbd139709

1544. By Michael Jeanson <email address hidden> on 2021-04-15

fix: refactor contexts for type description structures

The 'preemptible' and 'migratable' contexts were not refactored along
the others in :

  commit 437d5aa59380583ce1cd14d394a53b398be1275d
  Author: Mathieu Desnoyers <email address hidden>
  Date: Wed Apr 7 14:52:27 2021 -0400

    Refactoring: type description structures

Change-Id: I8a228c0ff982a4aded27b055baae1f5efec29164
Signed-off-by: Michael Jeanson <email address hidden>
Signed-off-by: Mathieu Desnoyers <email address hidden>

1543. By Michael Jeanson <email address hidden> on 2021-04-15

fix: remove 'src/' from modules install path

The move of the modules sources in the 'src/' subdirectory had the
unexpected side effect of adding 'src/' to the module install path
inside '/lib/modules/$(uname -r)/extra'. Adjust the Makefiles to return
to the initial behavior.

Change-Id: I280fe8a1e5ef367edeec0a6351351a233cc6f0be
Signed-off-by: Michael Jeanson <email address hidden>

Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: Ifcc64ea95c0e1435567150d976d42e3add3f7523

1542. By Michael Jeanson <email address hidden> on 2021-04-15

fix: Adjust ranges for Ubuntu 5.4.0-67 kernel

Signed-off-by: Michael Jeanson <email address hidden>
Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: Ifa0f50ffdc946d80b67bb5ae7ca4b0aa152e825b

1541. By Michael Jeanson <email address hidden> on 2021-04-15

fix: block: add a disk_uevent helper (v5.12)

See upstream commit:

  commit bc359d03c7ec1bf3b86d03bafaf6bbb21e6414fd
  Author: Christoph Hellwig <email address hidden>
  Date: Sun Jan 24 11:02:39 2021 +0100

    block: add a disk_uevent helper

    Add a helper to call kobject_uevent for the disk and all partitions, and
    unexport the disk_part_iter_* helpers that are now only used in the core
    block code.

Change-Id: If6e8797049642ab382d5699660ee1dd734e92c90
Signed-off-by: Michael Jeanson <email address hidden>
Signed-off-by: Mathieu Desnoyers <email address hidden>

1540. By Mathieu Desnoyers on 2021-04-15

Fix: perf counters: uninitialized field

Reported by Coverity:
** CID 1452572: Uninitialized variables (UNINIT)
>>> Using uninitialized value "ctx_field". Field "ctx_field.get_size_arg" is uninitialized when calling "lttng_kernel_context_append".

Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I064260c6fe78af24768bb141fde2864d2abbe3a5

1539. By Mathieu Desnoyers on 2021-04-14

Cleanup: implement dedicated file operations for events and enablers

In order to simplify the code in preparation for refactoring of the
event structures, remove the "event type" field and implement specific
file operations for events and enablers.

Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I508bdb46fa3747112e7cfef4a62278fb566f842a

1538. By Mathieu Desnoyers on 2021-04-14

Namespace LTTng modules ABI with lttng_kernel_abi_ prefix

Standardize on lttng_kernel_abi_ prefix for the lttng modules ABI to
eliminate namespace clash between lttng-modules core code and its ABI.

Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I3b1c8d6f46702e57defa17d683ede576466ba3ce

1537. By Mathieu Desnoyers on 2021-04-14

Refactoring: type description structures

Refactoring:

- Type description structures: new API based on structure inheritance
  rather than union,
- Rely on compound literals,
- Rename description fields: name -> event_name,
- Rename types (lttng_kernel_ namespace):
  - struct lttng_kernel_event_desc,
  - struct lttng_kernel_event_field,
  - struct lttng_kernel_ctx.
- Move some internal definitions (not used by probes) to
  events-internal.h.
- Streamline context registration API,
- Introduce the LTTNG_CREATE_FIELD_METADATA define for the tracepoint
  code generation pass which generates the type descriptions, allowing
  to describe structures as an array of fields, and use enumerations
  from those fields.
- Adapt all tracepoint instrumentation to those changes.

Signed-off-by: Mathieu Desnoyers <email address hidden>
Change-Id: I9a968a62888c52438a1f62ec24fcced4c3fd6ddf